Drafting-triangle.



R. SAAS.

DRAFTING TRIANGLE;

APPLICATION FILED DBO. 1e, 1909.

987,917. Patented 11131128, 1911.

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@NEFF Si ROBERT SAAS, 0F NEW YORK, N. Y.

DRAFTING-TRIANGLE.

Speeication of Letters Patent.

Patented Mar. 28, 1913i.

Application filed December' 16, 1909. Serial No. 533,358.

To all whom t may concern:

Be itknown that I, ROBERT SAAS, a subject of the King of Hungary, residing at New York, county of New York, and State of New York, have invented certain new and useful Improvements in Drafting-Triangles, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

rlhis linvention relates generally to improvements in drafting instruments, and particularly relates to a' drafting triangle which is adjustable and so constructed that it may be used on either side and lie flaton the surface on which employed and thus permit any degree or angle to be accurately A further object of the invention is to provide such a triangle, the sides of which shall be so connected that they may be folded together so that the triangle when folded may be conveniently carried in the pocket of the coat or vest.

With these objects in view the triangle consists in certain constructions and arrangement of parts which are shown in the following drawings in which Figure l is a face view of the triangle, the side forming the hypotenuse being shown in two di'erent positions in full and dotted lines. Fig. 2 is an edge view looling to the right of Fig. 1. Fig. 3 is an edge view partly in section looking toward the left of Fig. 1. Fig. 4f is a cross section on an enlarged scale taken on lines 4-4 of Fig. 1. Fig. 5 is an enlarged face view of the means employed for detachably securing the perpendicular side and the base. Fig. 6 is a section taken on lines 6-6 of Fig. 5. Fig. 7 is a section taken on lines 7 -7 of Fig. 6. Fig. 8 is a section similar to Fig. 6, the parts being separated. Fig. 9 is a cross section taken on lines 9-9 of Fig. 1. Fig. 10 is a face view of the triangle showing it in its folded position.

Referring now to said drawings which illustrate a preferred embodiment of the improved triangle, the triangle is shown as comprising a base 1, a perpendicular 2 and a hypotenuse 3. These parts or sides are connected together by suitable connections so that the hypotenuse is adjustable relatively to the base and perpendicular, and the latter two sides detachably united so that when desired they may be separated and the sides folded together. The sides are also formed and connected so that the outer edges of either the top and bottom surfaces of the sides, which edges form the drawing edges, will lie fiat on the drawing surface, there being no parts projecting above such surfaces which would prevent them from so lying, as shown in Figs. 2 and 3, the connections joining or uniting the sides being either iiush with such surfaces or within the plane thereof. The particular con struction of the parts and connections may be somewhat varied. As shown the hypotenuse is slidable along the base 1, which has one surface cut away as indicated by dotted line m Fig. l, and which cut away part is provided with a slot et, the sides of which are slightly beveled as indicated at 5. rThis slot forms a seat for a connection indicated generally by 6 (Fig. l) by which one end of the hypotenuse 3 is slidingly connected to the base. This end of the hypotenuse so connected to the base has one surface cut away so that it and the base will overlap as shown in Fig. 8 and the hypotenuse may be slid along the base, following the dot-ted line ze. The cut away portion on the hypotenuse is formed as shown in Figfl, so as to allow it to be freely slid along the base as it assumes different positions relatively thereto. A further cut away portion 9 is also provided which may be provided with an indicating line 11, which may be brought into alinement with a degree scale 12 on the inner edge of the base at whatever angle the hypotenuse may be to the base, any desired degree or angle from 15" to OO being thus easily ascertained. As the hypotenuse is slid along the base from right to left, Fig. 1, it assumes a position approaching more and more to a vertical or perpendicular, rising from the base as it is so moved. Means are provided whereby this movement is compensated for, which means may be somewhat varied. As illustrated, the end of the hypotenuse opposite that slidingly connected with the base, is provided with a cut-away portion 15, in which cut-away portion is a slot 16, in which is adapted to work a stud 17 fast on the end of a connection 18, being secured thereto in any suitable manner. The slot extends through the hypotenuse and on the side opposite the cut-away portion 15 is beveled and the stud 17 is beveled to correspond thereto, as shown at 19 (Fig. 9), the stud being thus prevented from being pulled through the slot. The connection 13 at the end on which the stud is attached extends slightly beyond the slot and seats on the cut away portion 15, as shown in Figs. 1 and 9. The other end of this connection 1S is rigidly secured to the upper end of the perpendicular 2 and is countei'suiik in such end so as to be flush with the surface thereof, as indicated in Fig. 9, being secured thereto by screws 13.

Means are provided for securing the end of the hypotenuse 3 which slides in the base securely in position after it has been adjusted relatively thereto to obtain the desired angle. As shown, the connection 6 by which the hypotenuse is connected with the base as before referred to, comprises a square headed stud or hub 20, the head of this stud being counter-sunk in the hypotenuse so as to be flush with the surface thereof, as shown in Fig. 41. rl`his stud or hub is provided with a threaded shank 21, on which is secured a nut 22, this nut having beveled sides 23 which cooperate with the walls of the slot 4f before referred to. This nut when screwed tight holds the hypotenuse securely in position and is, as indicated (Fig. l) slightly below the surface of the base. Means may be provided for preventing accidental displacenient of this nut, which means comprise a dish 24 apertured at to receive a tool, which disk is adapted to be screwed on a threaded projection 26 on the end of the hub or stud 20, and prevent the nut 22 from becoming` displaced, this disk being fiush with the surface of the base 1.

By loosening the nut 22 it is obvious that the hypotenuse of the triangle can be slid along the base so as to form any desired angle from 450 to 90 on one side of a given perpendicular, and by reversing the triangle any angle from 1150 toSOO may be produced on the other side of the perpendicular, the sides and connections being arranged as de scribed so as to leave no projecting parts and thus prevent the sides from lying flat on the drafting surface when so reversed. As before stated, one feature of the invention is to provide a triangle of this kind which can be folded up, the base and perpendicular being dctachably secured so that this can be done, and at the same time provide connections which will be flush with the surfaces of the base and perpendicular on both sides so that the triangle will lie flat on the surface with which it is to be used on either side. lt is further desirable that the means for detachably securing these parts together be such that a rigid connection may be formed and one which will not give or yield during the act of using the triangle. rlhese connections and means may be of any suitable character. In the particular construction illustrated, the end of the base 1 and the contiguous end of the perpendicular 2 are cut away, as shown in Figs. 6 and 3 of the drawing so as to lap over on to each other and form a flush joint and the ends are rigidly and detachably secured together by devices which will now be described.

Referring to Figs. 5 to 3, the cut-away portion on the perpendicular 2 has set in it so as to be flush therewith a plate 30, which plate has riveted or otherwise fiXedly secured therein a hub or stud 31, which is formed with a plurality of solid arms or wings 32, these arms or wings 32 being thus iiXedly secured in the perpendicular 2. The base 1 has set into it so as to be flush with the surface thereof a fitting 33, which fitting is provided with as many slotted arms or wings 311 as there are solid arms 32, extending from a central portion 35 which surrounds the hub or stud 31, before referred to, on which the solid arms or wings 32 are carried. The solid arms 32 fit into and engage the slotted arms or wings 34: and the )arts are thus held firmly against relative movement. For positively holding the parts in their proper position, there is provided a thumb nut 3G. T his thumb nut is screwed into 4a threaded aperture provided in the hub or stud 31, before referred to, the head of this thumb nut engaging the base 1, the fitting 33 and the hub or stud 31 and binding all the parts firmly together. lfhen it is desired to fold up the instrument, the thumb nut 36 is loosened and the parts separated, as shown in Fig. 3, the nut 24 being also loosened and the base 1 being lifted or raised slightly if necessary, and the legs of the triangle folded together, as shown in Fig. 10, when it may easily and yconvenient-ly be carried in the pocket of a coat or vest.

As before referred to the base is provided with a degree scale 12, and may also be provided with an inch scale 10. It will be understood that these scales may be duplicated on the other side of the base, for use when the triangle is used on the side opposite to that shown in Fig. 1. 1t is valso understood that the specific construction of parts described inay be varied and that the invention is not to be limited to such specific construction. v

Vhat is claimed is 1. 1n a drafting triangle, a base, a perpendicular detachably secured to the base, a hypotenuse connected with the base and perpendicular and movable relatively thereto, and connections for connecting said sides together, said sides having their outer edges of substantially equal thickness and said connections being flush with the surfaces of said sides so that the triangle will lie flat on the draft-ing surface on either side.

2. In a drafting triangle, a base, a perpendicular detachably secured thereto, a hypotenuse slidingly connected to the base, said sides at their points of connection being cut away so as to over lap and form flush joints, and connections flush with the surfaces of the sides, so that the triangle will lie fla-t on t-he drafting surface on either side.

3. In a drafting triangle, a base, a perpendicular secured to the base, a hypotenuse connected at one end with the base so as to slide thereon to form any angle between 45o and 90O and at the other end connected with the perpendicular so as to be movable relatively thereto, and connect-ions flush with the surfaces of the sides for connecting the sides together so that the triangle will lie hat on the drafting surface on either side.

4. In a drafting triangle, a base, a hypotennse connected to the base so as to be movablethereon, a perpendicular provided with a fitting having a plurality of projections, a tting on the base having a plurality of sockets with which said projections co-act to hold the contiguous ends of the base and perpendicular rigidly together, said base, perpendicular and fittings forming a smooth surface when united together.

5. In a drafting triangle, a base having one of its surfaces partially cut away longitudinally, a perpendicular secured to one end of the base, a hypotenuse having one of its surfaces at one end partially cut away and at that end overlapping on the cut away portion of the base and connections between the base and the hypo-tenuse co-acting with the walls of a slot in the cut away portion of the base whereby the hypotenuse may be slid along the base to forni any angle between 45 and 900, and a connection between the hypotenuse and perpendicular and movable on one of them whereby the hypotenuse may be moved relatively to the perpendicular, said connections being flush with the surfaces connected by them.

6. ln a drafting triangle, a base, a perpendicular detachably secured to the base, a hypotenuse connected at one end with the base so as to be slidable thereon from a position forming an angle of -lo to a position forming an angle of 900 and at the other end connected with the perpendicular so as to be movable relatively thereto, and connections for connecting the sides flush with thc surfaces thereof. n

In testimony whereof, I have hereunto set my hand, in the presence of two subscribing witnesses.

ROBERT SAAS. lVitnesses':

P. B. PHILIPP, J. A. GRAVES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

